US5191805A - Anti-friction nut - Google Patents
Anti-friction nut Download PDFInfo
- Publication number
- US5191805A US5191805A US07/818,886 US81888692A US5191805A US 5191805 A US5191805 A US 5191805A US 81888692 A US81888692 A US 81888692A US 5191805 A US5191805 A US 5191805A
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- United States
- Prior art keywords
- bearing means
- nut
- bore
- friction
- axial bore
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
- F16H25/2247—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with rollers
- F16H25/2261—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with rollers arranged substantially perpendicular to the screw shaft axis
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/19—Gearing
- Y10T74/19642—Directly cooperating gears
- Y10T74/19698—Spiral
- Y10T74/19702—Screw and nut
- Y10T74/19744—Rolling element engaging thread
- Y10T74/19781—Non-recirculating rolling elements
- Y10T74/19791—Cylindrical or quasi-cylindrical roller element [e.g., inclined roller, etc.]
- Y10T74/198—Perpendicular to shaft
Definitions
- This invention relates generally to low-friction nut constructions, and more particularly to improvements in the devices described and illustrated in U.S. Pat. No. 3,296,880 dated Jan. 10, 1967, issued to A. Maroth, and entitled RADIAL ROLLER ANTI-FRICTION TRANSMISSION.
- the above identified patent discloses a number of low-friction nut followers adapted for engagement with elongate screws of one type or another, or with splines.
- a nut body having radially extending holes which accept a series of rollers that engage the threads of a screw passing through the nut bore.
- Each roller (70) is turnably carried in a needle bearing (48).
- the rollers preferably are backed up by washer-like thrust ball bearings (50), which latter are held in position by disc-like threaded plugs (60a) screwed into the radial holes of the nut body.
- FIG. 7 Shownate constructions are illustrated in FIG. 7, showing a modified thrust bearing comprising a cage (54) and balls (52); and FIG. 9, which illustrates an arrangement where springs (83, 85) are employed between the threaded plugs and the roller elements (78, 82), in order to bias the latter inwardly and thereby tend to adjust the load on each element.
- roller-carrying drive nuts are shown in U.S. Pat. No. 3,779,094 dated Dec. 18, 1973, issued to B. LaBarre, and entitled REVERSING NUT FOR A DIAMOND THREAD SCREW; and U.S. Pat. No. 3,792,616 dated Feb. 19, 1974, issued to M. Wentzel, and entitled RECIPROCATING DRIVE.
- radially disposed rollers are carried by means of bushings (40).
- Each roller has a pair of needle bearings and an end thrust bearing, together with a pair of back-to-back springs (36) which normally bias the rollers forward into engagement with the screw threads, but which can yield outwardly an extent in the event a particular roller experiences an excessive radially outward force.
- the end result was a tendency for the springs to equalize the forces applied to each roller.
- the nut was employed with a screw shaft having a pair of aligned closed loop-like grooves in which the rollers were received, so that the resulting motion of the nut was to reciprocate as the shaft was turned.
- U.S. Pat. No. '094 discloses a reversing nut construction having a nut body with radially extending holes in which there is received a series of radially extending rollers, for engagement with the threads of a diamond thread shaft.
- radial bushings as housings for the respective rollers, and a pair of needle bearings is interposed between each roller and the wall of its bushing. Thrust bearings are located at the outermost end of each roller.
- a related object of the invention is to provide an improved low-friction nut assembly as above set forth, which can be assembled with a minimum of time and effort, and with little adjustment being required.
- Still another object of the invention is to provide an improved low-friction nut assembly of the kind indicated, wherein manufacturing cost is substantially reduced as a consequence of the reduced number of individual parts required.
- Yet another object of the invention is to provide an improved low-friction nut assembly as above characterized wherein the radial thrust forces applied to the roller are effectively accommodated by simple ball bearings, as opposed to needle bearings, the ball bearings being available with considerably improved tolerances on the order of tenths of a mil.
- a still further object of the invention is to provide an improved low-friction nut assembly as above characterized, wherein considerable manufacturing economies are realized over the devices of the prior art, as a consequence of greatly simplified assembly procedures.
- the invention provides a light-weight miniature, high-speed, light-load anti-friction nut assemblage adapted to receive a screw, comprising a nut body having an axial bore through which the screw can pass, and having a second bore extending transversely of its axis and intersecting the axial bore.
- the second bore has a substantially smooth and uninterrupted surface, devoid of projections.
- the roller pin is carried on a first miniature anti-friction bearing having inner and outer races, with adhesive being applied between the inner race and the roller pin and between the outer race and the walls of the second bore.
- a second miniature anti-friction bearing disposed in an annular recess in the axial bore of the nut body, which centralizes the nut body on the screw for relative turning with respect thereto.
- This second anti-friction bearing has inner and outer races, and adhesive is applied between the outer race of this second antifriction bearing and the walls of the recess in the nut body, so as to retain the bearing captive in the nut body.
- the arrangement is such that the bearing for the roller pin can be readily applied thereto with resinous adhesive material, such as that sold under the registered trademark "Loctite", and thereafter such assemblage can be inserted into the second or radial bore of the nut, again with adhesive applied to hold the outer race of the bearing rigid with the walls of the second bore.
- the position of the roller pin and bearing are prior to the setting of the adhesive, manually positioned so that the nose of the roller pin is a predetermined distance from the root of the screw, and the adhesive is then allowed to dry.
- the relatively tight tolerances provided by the precision ball bearings typically, an I. D.
- the ball bearing associated with the roller pin is capable of countering both transverse and axial thrust forces applied by the screw to the roller pin, and there is thus eliminated the requirement of a separate thrust bearing or spring at the head of the roller, as was needed in just about all prior designs.
- FIG. 1 is an axial section of the improved nut assembly of the invention, shown with a single roller carried in a radial bore of the nut body by means of dual ball bearings, inner and outer.
- FIG. 2 is a top plan view of the nut assembly and screw of FIG. 1, and
- FIG. 3 is a right side elevation of the nut assembly and screw of FIGS. 1 and 2.
- an anti-friction nut assemblage generally designated by the numeral 10 and adapted for use with a screw 12 having a thread groove 14.
- the nut assemblage 10 comprises a nut body 16 having an axial bore 18 through which the screw 12 passes, and having a second bore 20 disposed radially, or transversely of the nut body bore 18.
- roller pin 22 Disposed in the radial bore 20 is a roller pin 22 having a nose 23 extending into the thread groove 14, for engagement with the walls of the groove.
- adhesive-secured or anchored means including anti-friction bearings for mounting the roller 22, such bearings in the present instance comprising two precision ball bearings 24 having inner races 26 and outer races 28.
- the roller pin 22 is secured to the inner race 26 of each bearing by means of adhesive, preferably that known by the trademark, "Loctite", first using Loctite adhesive primer #T-747, followed by Loctite adhesive #262.
- the opposite ends of the nut body 16 are provided with annular recesses 30, and centralizing ball bearings 32 secured in said recesses 30 by adhesive similar to that employed with the bearings 24.
- the adhesive is applied to the outer races of bearings 32 and to the walls of the annular recesses 30, following which the bearings 32 are pressed in place.
- the innermost surfaces of the inner bearing 24 are disposed a greater distance from the axis of the bore 30 than the wall portions of the axial bore 30. This is an important feature of the invention since it minimizes the likelihood of adhesive coming in contact with the screw 12 during the assembly operations, especially if by inadvertence a slight excess of adhesive should be present.
- the diameters of the inner races of the bearings 32 are such that there exists a sliding fit with the crest or exposed walls of the screw thread 12. Further, according to the invention, wall portions of the axial bore 30 indicated at 34 which are disposed at locations between the bearings 32 have diametric surfaces which are disposed at a distance from the screw axis which is greater than the inside radius of the inner races of the bearings 32, to prevent adhesive from contacting the screw 12.
- a single roller pin 22 can be employed. Under such circumstances, the number of components is kept to an absolute minimum, and the use of adhesive for securing the inner and outer races of the bearings to the roller pin and walls of the radial bore has been found to be both highly satisfactory from the standpoint of operation, and economy, since there are eliminated the need for special biasing springs, spring washers, retaining washers, and the like.
- the present construction has an additional advantage in that the use of needle bearings has been completely eliminated. Instead, physically small, high-precision ball bearings of a readily-available type are employed. The tolerances of the bearings can be held very closely. As an example, the tolerance of the inside diameter of the roller bearings for one application currently being employed, is +0.0000 inch, -0.0002 inch.
- roller pin eliminates the need to set and re-adjust multiple pins separately, as in the prior art devices, where such successive adjustments were often critical and difficult to achieve in practice.
- the disclosed adhesive-secured anti-friction nut assemblage thus constitutes a distinct advance and improvement in the field of mechanical transmissions.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
Abstract
Description
Claims (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/818,886 US5191805A (en) | 1992-01-10 | 1992-01-10 | Anti-friction nut |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/818,886 US5191805A (en) | 1992-01-10 | 1992-01-10 | Anti-friction nut |
Publications (1)
Publication Number | Publication Date |
---|---|
US5191805A true US5191805A (en) | 1993-03-09 |
Family
ID=25226684
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07/818,886 Expired - Lifetime US5191805A (en) | 1992-01-10 | 1992-01-10 | Anti-friction nut |
Country Status (1)
Country | Link |
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US (1) | US5191805A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1996014522A1 (en) * | 1994-11-03 | 1996-05-17 | Norco, Inc. | Mechanical oscillator |
WO1997002441A1 (en) * | 1995-07-05 | 1997-01-23 | Norco, Inc. | Mechanical drive assembly |
US5644950A (en) * | 1995-11-17 | 1997-07-08 | Norco, Inc. | Heavy-duty mechanical oscillator |
DE102005006475B3 (en) * | 2005-02-12 | 2006-05-24 | Lutz-Jesco Gmbh | Device for conversion of rotational movement into reciprocating movement has transmission component in form of disc-form wheel mounted on pin which is fixed at angle in or on driven component |
US20110232407A1 (en) * | 2008-09-23 | 2011-09-29 | Armin Verhagen | Helical gearing |
US20120174691A1 (en) * | 2009-09-28 | 2012-07-12 | Hiroyuki Yamada | Linear actuator |
US20160025197A1 (en) * | 2011-12-22 | 2016-01-28 | József Gulyas | An inescapable path to transform a form of motion |
US10364889B2 (en) * | 2015-03-27 | 2019-07-30 | Honda Motor Co., Ltd. | Speed change apparatus for power unit |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB190601044A (en) * | 1906-01-15 | 1907-01-15 | Luke And Spencer Ltd | New or Improved Traversing Mechanism for the Tables of Planing and Shaping Machines and the like |
FR526586A (en) * | 1920-05-14 | 1921-10-11 | Mors Electricite | Movement transmission device by screw and nut |
US3766788A (en) * | 1972-08-23 | 1973-10-23 | Norco Inc | Radial roller anti-friction transmission with eccentric bushings |
US4008625A (en) * | 1975-12-15 | 1977-02-22 | Norco, Inc. | Floating nut construction |
US4198872A (en) * | 1978-07-28 | 1980-04-22 | Norco, Inc. | Mechanical screw transmission |
-
1992
- 1992-01-10 US US07/818,886 patent/US5191805A/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB190601044A (en) * | 1906-01-15 | 1907-01-15 | Luke And Spencer Ltd | New or Improved Traversing Mechanism for the Tables of Planing and Shaping Machines and the like |
FR526586A (en) * | 1920-05-14 | 1921-10-11 | Mors Electricite | Movement transmission device by screw and nut |
US3766788A (en) * | 1972-08-23 | 1973-10-23 | Norco Inc | Radial roller anti-friction transmission with eccentric bushings |
US4008625A (en) * | 1975-12-15 | 1977-02-22 | Norco, Inc. | Floating nut construction |
US4198872A (en) * | 1978-07-28 | 1980-04-22 | Norco, Inc. | Mechanical screw transmission |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1996014522A1 (en) * | 1994-11-03 | 1996-05-17 | Norco, Inc. | Mechanical oscillator |
US5592852A (en) * | 1994-11-03 | 1997-01-14 | Norco, Inc. | Mechanical oscillator |
US5709127A (en) * | 1994-11-03 | 1998-01-20 | Norco, Inc. | Mechanical oscillator |
WO1997002441A1 (en) * | 1995-07-05 | 1997-01-23 | Norco, Inc. | Mechanical drive assembly |
US5680795A (en) * | 1995-07-05 | 1997-10-28 | Norco Inc. | Mechanical drive assembly incorporating counter-spring biassed radially-adjustable rollers |
US5860324A (en) * | 1995-07-05 | 1999-01-19 | Norco, Inc. | Mechanical drive assembly incorporating counter-spring biased, radially-adjustable rollers |
US5644950A (en) * | 1995-11-17 | 1997-07-08 | Norco, Inc. | Heavy-duty mechanical oscillator |
DE102005006475B3 (en) * | 2005-02-12 | 2006-05-24 | Lutz-Jesco Gmbh | Device for conversion of rotational movement into reciprocating movement has transmission component in form of disc-form wheel mounted on pin which is fixed at angle in or on driven component |
US20110232407A1 (en) * | 2008-09-23 | 2011-09-29 | Armin Verhagen | Helical gearing |
US20120174691A1 (en) * | 2009-09-28 | 2012-07-12 | Hiroyuki Yamada | Linear actuator |
US20160025197A1 (en) * | 2011-12-22 | 2016-01-28 | József Gulyas | An inescapable path to transform a form of motion |
US10364889B2 (en) * | 2015-03-27 | 2019-07-30 | Honda Motor Co., Ltd. | Speed change apparatus for power unit |
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